nonwritable-nonconfigurable-descriptors-set-by-param.js (1005B)
1 // Copyright (C) 2017 Caio Lima. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 description: Mapped arguments property descriptor change to non-writable and non-configurable 6 info: | 7 Mapping just stop working when property is set to non-writable. Change the 8 descriptor using [[DefineOwnProperty]] to {writable: false}, set a = 2 and then 9 change property descriptor to {configurable: false}. 10 The descriptor's value is the one set before the property be 11 configured as {writable: false} because mapping was removed. 12 flags: [noStrict] 13 esid: sec-arguments-exotic-objects-defineownproperty-p-desc 14 includes: [propertyHelper.js] 15 ---*/ 16 17 function fn(a) { 18 Object.defineProperty(arguments, "0", {writable: false}); 19 a = 2; 20 Object.defineProperty(arguments, "0", {configurable: false}); 21 22 verifyProperty(arguments, "0", { 23 value: 1, 24 writable: false, 25 enumerable: true, 26 configurable: false, 27 }); 28 } 29 fn(1); 30 31 32 reportCompare(0, 0);